tests: Add a crop test with the new "perserve_ar" config param

Signed-off-by: Naushir Patuck <[email protected]>

tests/crop_test.py

@@ -0,0 +1,24 @@
+#!/usr/bin/python3
+
+# How to do digital zoom using the "ScalerCrop" control.
+
+import cv2
+
+from picamera2 import Picamera2
+
+picam2 = Picamera2()
+
+for m, l in [(False, False), (False, True), (True, False), (True, True)]:
+    cfg = picam2.create_video_configuration(main={"size": (1920, 1080), "format": 'XRGB8888', "preserve_ar": m},
+                                            lores={"size": (640, 640), "format": 'XRGB8888', "preserve_ar": l},
+                                            display="main")
+    picam2.configure(cfg)
+    picam2.start(show_preview=True)
+
+    for _ in range(100):
+        im = picam2.capture_array("lores")
+        cv2.imshow("lores", im)
+        cv2.resizeWindow("lores", (640, 640))
+        cv2.waitKey(1)
+
+    picam2.stop()

tests/test_list.txt

@@ -62,6 +62,7 @@ tests/colour_spaces.py
 tests/config_with_sensor.py
 tests/configurations.py
 tests/context_test.py
+tests/crop_test.py
 tests/display_transform_null.py
 tests/display_transform_qt.py
 tests/easy_video2.py